21112665504424 has 16 divisors (see below), whose sum is σ = 42631343807220. Its totient is φ = 9744307155840.

The previous prime is 21112665504397. The next prime is 21112665504439. The reversal of 21112665504424 is 42440556621112.

It can be written as a sum of positive squares in 2 ways, for example, as 17971511875524 + 3141153628900 = 4239282^2 + 1772330^2 .

It is a super-2 number, since 2×21112665504424² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101503199437 + ... + 101503199644.

Almost surely, 2^{21112665504424} is an apocalyptic number.

It is an amenable number.

21112665504424 is an abundant number, since it is smaller than the sum of its proper divisors (21518678302796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112665504424 is a wasteful number, since it uses less digits than its factorization.

21112665504424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203006399100 (or 203006399096 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 21112665504424 in words is "twenty-one trillion, one hundred twelve billion, six hundred sixty-five million, five hundred four thousand, four hundred twenty-four".